@book{FriesenBerrGerdesetal., author = {Friesen, Hans and Berr, Karsten and Gerdes, Kevin and Lenk, Andreas and Sanders, G{\"u}nther}, title = {Philosophische Dimensionen des Problems der Virtualit{\"a}t in einer globalen Mediengesellschaft}, publisher = {Bis-Verlag}, address = {Oldenburg}, isbn = {3-8142-0763-7}, pages = {60}, language = {de} }